Katherine Jane "Katy" Harris (previously Nelson) is a fictional character from the British ITV soap opera Coronation Street, portrayed by Lucy-Jo Hudson.

The Nelson family had moved to Manchester from Sheffield after secretly being placed under a witness protection programme, as Angela was due to testify in a gangland murder trial.

[4]) Katy snuck away to see her friends in Sheffield but was followed back to Coronation Street by the brother of the defendant her mother was due to testify against.

Katy discovered that she is diabetic, and nurse and neighbour Martin Platt (Sean Wilson) helped her to get used to giving herself daily injections of insulin.

[5] The pair developed a romantic relationship, even though Martin was nearly 20 years older than Katy, almost as old as her father.

Katy befriended Martins children Sarah (Tina O'Brien) and David Platt (Jack P. Shepherd).

In May 2004, they split up after Katy revealed she knew that Todd Grimshaw (Bruno Langley) was cheating on Sarah with her friend Karl Foster (Chris Finch).

Katy's grandfather Keith Appleyard (Ian Redford) moved into the family home to help look after his grandchildren.

Angela planned to dispose of the murder weapon but could not get the opportunity, and tried to persuade the police that the gang had killed Tommy and for the family to be given new identities.

When the family visited the funeral parlour to view Tommy's body, Angela hid the wrench inside the coffin.

6. and decided she couldn't live with the guilt any longer and wrote a note confessing the truth about her father's death before committing suicide by destroying her insulin cartridges and drinking water mixed with sugar (a deadly solution, because of her diabetes).

On her exiting storyline, Hudson said of Katy; "she's turned into a right psycho, which is much more interesting than playing a sweet schoolgirl.

[13] Alex Ross from Planet Radio noted how Katy was very popular with fans during her time on the soap.